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in Quadrilaterals by (44.3k points)

The three angles of a quadrilateral are 76°, 54° and 108°. Find the measure of the fourth angle.

1 Answer

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Best answer

We know that there are four angles in quadrilateral.

Also know that sum of the angles of a quadrilateral is 360°

Let unknown angle be x

Sum of angles of quadrilateral = 76° + 54° +108°+x

360° = 238° + x

x = 122°

Therefore the fourth angle is 122°

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